The history of mirrors dates back to ancient times when man-kind first saw reflections in a pond or river, and considered it magic. At first, polished stone or metal was used in the first early manmade mirrors. Later, glass was used in combination with metals like tin, mercury and lead to create mirrors. Today, combining glass and metal is still the design used in almost all modern mirrors. The two-way mirror was originally called the ‘transparent mirror’. Just like a regular there is a silver coating on the glass of a two-way mirror, which, when applied to the back of the glass, renders the glass opaque and reflective on its face under ordinary light conditions.